US5582676A - Apparatus for applying adhesive onto scarf-cut face of veneer - Google Patents

Apparatus for applying adhesive onto scarf-cut face of veneer Download PDF

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Publication number
US5582676A
US5582676A US08/327,422 US32742294A US5582676A US 5582676 A US5582676 A US 5582676A US 32742294 A US32742294 A US 32742294A US 5582676 A US5582676 A US 5582676A
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United States
Prior art keywords
adhesive
veneer
scarf
cut face
driving mechanism
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Expired - Fee Related
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US08/327,422
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English (en)
Inventor
Toshiyuki Otsuka
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Meinan Machinery Works Inc
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Meinan Machinery Works Inc
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Assigned to MEINAN MACHINERY WORKS, INC. reassignment MEINAN MACHINERY WORKS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OTSUKA, TOSHIYUKI
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G11/00—Applying adhesives or glue to surfaces of wood to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/006—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to the edges of essentially flat articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
    • B27D1/10—Butting blanks of veneer; Joining same along edges; Preparatory processing of edges, e.g. cutting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/17—Surface bonding means and/or assemblymeans with work feeding or handling means
    • Y10T156/1798—Surface bonding means and/or assemblymeans with work feeding or handling means with liquid adhesive or adhesive activator applying means

Definitions

  • the present invention relates to an apparatus for applying an adhesive onto veneers having an obliquely-cut face for scarf joint (hereinafter referred to as scarf-cut face).
  • FIG. 1 One example of conventional apparatus for applying an adhesive on a scarf-cut face of a pre-worked veneer as shown in FIG. 1 is disclosed in JAPANESE UTILITY MODEL LAYING-OPEN GAZETTE No. H-1-13,301.
  • an adhesive stored in an adhesive reservoir is fed to a supply valve unit 131 by a pressure-feed pump.
  • the adhesive is supplied from the supply valve unit 131 onto a belt 129 spanning in a direction perpendicular to a veneer-feeding direction while the belt 129 goes half round to make a line of adhesive 141 adhere to the belt 129.
  • the line of adhesive 141 is taken up onto a scarf-cut face 105a of a veneer and then spread over the whole scarf-cut face 105a by a rolling belt 155.
  • the conventional adhesive-applying apparatus constructed as above has drawbacks described below.
  • the pressure-feed pump has upper-limit and lower-limit pressures preset for ensuring safe and smooth operations of the pump, and is controlled to work in a pressure range between the upper limit and the lower limit.
  • the pressure applied during operation of the pressure pump is accordingly varied in the pressure range between the upper limit and the lower limit. This results in variation in the amount of adhesive supplied from the supply valve unit 131.
  • the amount of adhesive supplied from the supply valve unit 131 is also varied with the viscosity of the adhesive.
  • the conventional apparatus requires a relatively complicated mechanism to realize the adhesive taken-up process and the spread-out process.
  • One object of the invention is to provide a novel apparatus for applying a substantially fixed amount of adhesive onto a scarf-cut face of a veneer.
  • Another object of the invention is to provide an adhesive-applying apparatus having a simple structure.
  • the invention is directed to an apparatus for applying an adhesive onto a veneer having at least one obliquely-cut face for scarf joint or a scarf-cut face.
  • the apparatus includes:
  • feeding means having an intermittent driving mechanism for feeding and transporting a veneer in a predetermined feeding direction along fibers of the veneer and stopping to hold the veneer at a predetermined holding position, the feeding means forming a transportation path along which veneers are fed and transported;
  • detector means for detecting the veneer transported by the intermittent driving mechanism of the feeding means and outputting a detection signal when existence of the veneer is detected;
  • adhesive reservoir means disposed at a position downstream the detector means in the predetermined feeding direction and apart from the transportation path for storing an adhesive
  • adhesive application means disposed at a position downstream the detector means in the predetermined feeding direction and having an adhesive-applying surface for applying the adhesive onto a scarf-cut face of the veneer transported and held at the predetermined holding position by the intermittent driving mechanism of the feeding means;
  • reciprocating means mounted on the adhesive application means for reciprocating the adhesive application means between a first position where the adhesive application means is inserted into the adhesive reservoir means to take the adhesive on the adhesive-applying surface thereof and a second position where the adhesive-applying surface of the adhesive application means is pressed in a substantially parallel configuration against the scarf-cut face of the veneer to apply the adhesive on the adhesive-applying surface to the scarf-cut face of the veneer, which is held at the predetermined holding position by the intermittent driving mechanism of the feeding means;
  • control means for receiving the detection signal output from the detector means, determining a position of the veneer, and controlling operations of the intermittent driving mechanism of the feeding means and the reciprocating means based on the position of the veneer.
  • the adhesive reservoir means having an open top is further provided with freely-adjustable space regulator means mounted on the open top of the adhesive reservoir means to define a space through which the adhesive application means is inserted in and pulled out of the adhesive reservoir means, so that a substantially fixed amount of adhesive is taken on the adhesive-applying surface of the adhesive application means.
  • the adhesive application means is, for example, an L-shaped or a T-shaped plate.
  • the space regulator means includes a freely-adjustable space regulator plate having a reverse truncated cone-shaped opening to define an area of the space through which the adhesive application means is inserted in and pulled out of the adhesive reservoir means, so as to allow a substantially fixed amount of adhesive to be applied onto the adhesive-applying surface of the adhesive application means.
  • the adhesive reservoir means has an inclined face and the space regulator means has a space regulator roll and a larger-diametral ring mounted on a circumference of the space regulator roll. While the larger-diametral ring rolls over the inclined face of the adhesive reservoir means to come into contact with the adhesive application means, the space regulator roll is held apart from the adhesive application means by a fixed distance, so as to allow a substantially fixed amount of adhesive to be applied onto the adhesive-applying surface of the adhesive application means.
  • an adhesive-applying apparatus includes:
  • feeding means having an intermittent driving mechanism for successively feeding and transporting a first veneer and a second veneer in a predetermined feeding direction along fibers of the veneers wherein the first veneer has at least a rear scarf-cut face and the second veneer has at least a front scarf-cut face, the intermittent driving mechanism being inactivated to hold the rear scarf-cut face of the first veneer at a first holding position and the front scarf-cut face of the second veneer at a second holding position, the feeding means forming a transportation path along which veneers are fed and transported,
  • detector means for detecting the second veneer transported by the intermittent driving mechanism of the feeding means and outputting a detection signal when existence of the second veneer is detected;
  • adhesive reservoir means disposed at a position downstream the detector means in the predetermined feeding direction and apart from the transportation path for storing an adhesive
  • adhesive application means disposed at a position downstream the detector means in the predetermined feeding direction and having first and second adhesive-applying faces for applying the adhesive onto the rear scarf-cut face of the first veneer held at the first holding position and onto the front scarf-cut face of the second veneer held at the second holding position,
  • reciprocating means mounted on the adhesive application means for reciprocating the adhesive application means between a first position where the adhesive application means is inserted into the adhesive reservoir means to take the adhesive on the first and the second adhesive-applying faces thereof, a second position where the first adhesive-applying face of the adhesive application means is pressed in a substantially parallel configuration against the rear scarf-cut face of the first veneer to apply the adhesive on the first adhesive-applying face to the rear scarf-cut face of the first veneer, which is held at the first holding position by the intermittent driving mechanism of the feeding means, a third position which is apart from the transportation path, and a fourth position where the second adhesive-applying face of the adhesive application means is pressed in a substantially parallel configuration against the front scarf-cut face of the second veneer to apply the adhesive on the second adhesive-applying face to the front scarf-cut face of the second veneer, which is held at the second holding position by the intermittent driving mechanism of the feeding means, and
  • control means for receiving the detection signal output from the detector means, determining positions of the first veneer and the second veneer, and controlling operations of the intermittent driving mechanism of the feeding means and the reciprocating means based on the positions of the first veneer and the second veneer, the control means outputting a first adhesive application signal when the front scarf-cut face of the second veneer reaches the detector means and activating the reciprocating means to move the adhesive application means from the first position to the second position to apply the adhesive onto the rear scarf-cut face of the first veneer which is held at the first holding position, the control means outputting a stand-by signal when application of the adhesive onto the rear scarf-cut face of the first veneer is completed and activating the reciprocating means to move the adhesive application means from the second position to the third position, the control means outputting a second adhesive application signal when the front scarf-cut face of the second veneer reaches the second holding position and activating the reciprocating means to move the adhesive application means from the third position to the fourth position to apply the adhesive onto the front scarf-cut face of the second veneer.
  • the apparatus of the invention may be constructed to apply the adhesive either one of the rear scarf-cut face of the first veneer and the front scarf-cut face of the second veneer.
  • the intermittent driving mechanism of the feeding means includes a first intermittent driving mechanism for transporting the first veneer and a second intermittent driving mechanism for transporting the second veneer.
  • the control means first outputs an adhesive application signal when the front scarf-cut face of the second veneer reaches the detector means, inactivates the second intermittent driving mechanism of the feeding means to stop transportation of the second veneer, and activates the reciprocating means to move the adhesive application means from the first position to the second position to apply the adhesive onto the rear scarf-cut face of the first veneer which is held at a predetermined holding position by the first intermittent driving mechanism of the feeding means.
  • the control means then outputs an end-of-application signal when application of the adhesive onto the rear scarf-cut face of the first veneer is completed and re-activates the first and the second intermittent driving mechanisms of the feeding means to resume transportation of the first veneer and the second veneer in the predetermined feeding direction.
  • the control means subsequently outputs a waiting signal when a rear end of the first veneer reaches a predetermined waiting position and inactivates the first intermittent driving mechanism of the feeding means to hold the rear end of the first veneer at the predetermined waiting position.
  • the control means outputs a joint signal when a front end of the second veneer reaches the predetermined waiting position and inactivates the second intermittent driving mechanism of the feeding means to hold the front end of the second veneer at the predetermined waiting position.
  • control means first outputs a waiting signal when a rear end of the first veneer reaches a predetermined waiting position and inactivates the first intermittent driving mechanism of the feeding means to hold the rear end of the first veneer at the predetermined waiting position.
  • the control means then outputs an adhesive application signal when the front scarf-cut face of the second veneer reaches a predetermined holding position, inactivates the second intermittent driving mechanism of the feeding means to hold the second veneer at the predetermined holding position, and activates the reciprocating means to move the adhesive application means from the first position to the second position to apply the adhesive onto the front scarf-cut face of the second veneer which is held at the predetermined holding position by the second intermittent driving mechanism of the feeding means.
  • the control means subsequently outputs an end-of-application signal when application of the adhesive onto the front scarf-cut face of the second veneer is completed and re-activates the second intermittent driving mechanism of the feeding means to resume transportation of the second veneer in the predetermined feeding direction.
  • the control means outputs a joint signal when a front end of the second veneer reaches the predetermined waiting position and inactivates the second intermittent driving mechanism of the feeding means to hold the front end of the second veneer at the predetermined waiting position.
  • the apparatus further includes joint means for bringing the front scarf-cut face of the second veneer into contact with the rear scarf-cut face of the first veneer, and pressure means for applying a predetermined pressure onto the joint of the front scarf-cut face of the second veneer and the rear scarf-cut face of the first veneer to securely join the second veneer with the first veneer.
  • the invention is also directed to another adhesive-applying apparatus including:
  • feeding means having an intermittent driving mechanism for feeding and transporting a veneer in a normal feeding direction and a reverse feeding direction, which is opposite to the normal feeding direction, along fibers of the veneer, the feeding means forming a transportation path along which veneers are fed and transported;
  • detector means for detecting the veneer transported by the intermittent driving mechanism of the feeding means and outputting a detection signal when existence of the veneer is detected;
  • adhesive reservoir means disposed at a position downstream the detector means in the normal feeding direction and apart from the transportation path for storing an adhesive
  • adhesive application means disposed at a position downstream the detector means in the normal feeding direction and having an adhesive-applying surface for applying the adhesive onto a scarf-cut face of the veneer transported by the intermittent driving mechanism of the feeding means;
  • reciprocating means mounted on the adhesive application means for reciprocating the adhesive application means between a first position where the adhesive application means is inserted into the adhesive reservoir means to take the adhesive on the adhesive-applying surface thereof and a second position where the adhesive-applying surface of the adhesive application means is held in a middle of the transportation path and substantially parallel to the scarf-cut face of the veneer to apply the adhesive on the adhesive-applying surface to the scarf-cut face of the veneer;
  • control means for receiving the detection signal output from the detector means, determining a position of the veneer, and controlling operations of the intermittent driving mechanism of the feeding means and the reciprocating means based on the position of the veneer, the control means activating the intermittent driving mechanism of the feeding means to transport the veneer in either the normal feeding direction or the reverse feeding direction while activating the reciprocating means to hold the adhesive application means in the middle of the transportation path to wait for approach of the veneer, so that the scarf-cut face of the veneer is pressed against the adhesive-applying surface of the adhesive application means in a substantially parallel configuration.
  • any of the above apparatuses presses the adhesive-applying surface of the adhesive application member against the scarf-cut face of the veneer in a substantially parallel configuration, thus allowing a substantially fixed amount of adhesive to be applied onto the scarf-cut face of the veneer.
  • FIG. 1 is a side view illustrating an apparatus of the prior-art structure
  • FIG. 2 is a side view schematically illustrating an apparatus for applying an adhesive onto scarf-cut faces of veneers as a first embodiment according to the invention
  • FIG. 3 is a cross sectional view taken on the line III--III of FIG. 2;
  • FIG. 4 shows operation of the apparatus in the embodiment
  • FIG. 5 also shows operation of the apparatus in the embodiment
  • FIGS. 6A through 6F schematically show an adhesive application process in the embodiment
  • FIGS. 7A through 7C show modification of the adhesive application process
  • FIG. 8 is an enlarged view showing a typical structure of a space regulating mechanism
  • FIGS. 9A and 9B illustrate another structure of the space regulating mechanism
  • FIGS. 10A through 10D show operations of another adhesive-applying apparatus as a second embodiment according to the invention.
  • FIG. 11 is a side view showing still another adhesive-applying apparatus as a third embodiment according to the invention.
  • FIG. 2 is a side view schematically illustrating an apparatus for applying an adhesive onto a scarf-cut face of veneers as a first embodiment according to the invention.
  • FIG. 3 is a cross sectional view taken on the line III--III of FIG. 2.
  • FIGS. 4 and 5 show operation of the apparatus in the embodiment, and FIGS. 6A through 6F schematically show an adhesive application process in the embodiment.
  • FIG. 8 is an enlarged view showing a typical structure of a space regulating mechanism.
  • a plurality of feeding rolls 2 and 4 for feeding veneers have a length, in a direction perpendicular to a feeding direction of veneers, equal to or greater than the width of veneers.
  • the upper feeding roll 2 and the lower feeding roll 4 are supported by a frame (not shown) of the apparatus to bring the circumferential faces of the rolls into contact with each other.
  • a power-driven motor (not shown) functioning as an intermittent driving mechanism is connected to the lower feeding roll 4 via a clutch mechanism (not shown). Veneers are fed at appropriate intervals by the action of the clutch mechanism.
  • a plurality of detectors 6 for detecting existence of veneers and outputting detection signals are arranged in the direction perpendicular to the veneer-feeding direction and attached to the frame via an appropriate fixing element (not shown).
  • Typical examples of the detectors 6 are phototubes and limit switches.
  • a pressure roll 8 descends and presses a veneer against the top face of a table 10 to hold a front end of the veneer at a fixed position.
  • the pressure roll 8 has a length, in the direction perpendicular to the veneer-feeding direction, equal to or greater than the width of veneers.
  • the pressure roll 8 is supported (not shown) to allow driven rotations and attached to the frame via a vertical reciprocating mechanism such as a cylinder (not shown).
  • An open-topped adhesive reservoir 40 having a length, in the direction perpendicular to the veneer-feeding direction, equal to or greater than the width of veneers stores a thermosetting adhesive, such as a urea resin adhesive or a phenol resin adhesive.
  • the adhesive reservoir 40 is provided with a temperature-regulating hole 40a which is formed in the side wall of the reservoir 40. Cooling water of approximately 13° C. is fed from a cooling water tank (not shown) and circulates through the temperature regulating hole 40a by a pump (not shown).
  • the adhesive reservoir 40 also has an adhesive-supply aperture 40b formed in the bottom of the reservoir 40.
  • thermosetting adhesive is supplied from an adhesive tank (not shown) through the adhesive-supply aperture 40b into the adhesive reservoir 40 by means of a pump (not shown).
  • a freely-adjustable space regulator plate 38 is mounted on the adhesive reservoir 40.
  • the space regulator plate 38 freely moves in a radial direction of the open top of the adhesive reservoir 40 to set desirable dimensions of a reverse truncated cone-shaped opening on the center thereof.
  • the opening defines a first space S1 and a second space S2 through which an adhesive application member 24 (described later) is inserted in and pulled out of the adhesive reservoir 40, so as to allow a substantially fixed amount of the thermosetting adhesive to be applied onto each adhesive-applying face (described below) of the adhesive application member 24.
  • the adhesive application member 24 has first and second adhesive-applying faces 24a and 24b as clearly shown in FIG. 5.
  • the thermosetting adhesive adhering to the first and the second adhesive-applying faces 24a and 24b of the adhesive application member 24 are applied onto a rear scarf-cut face of a first veneer and a front scarf-cut face of a second veneer, which are successively fed by the plurality of feeding rolls 2 and 4.
  • the adhesive application member 24 is an L-shaped plate having a length, in the direction perpendicular to a feeding direction of veneers, equal to or greater than the width of veneers.
  • a short arm of the L-shaped adhesive application member 24 is fixed by a plurality of pivot mechanisms 26 each having a shaft 26A as shown in FIG. 3.
  • each pivot mechanism 26 is rotatably supported by a lifting member 28 and fixed to a pivot arm 30.
  • Each lifting member 28 is provided with a cylinder 32 and a female screw plate 36 working as a driving mechanism.
  • the plurality of lifting members 28 are joined with each other via a joint plate 34 having a length, in the direction perpendicular to a feeding direction of veneers, equal to or greater than the width of veneers.
  • a rod of the cylinder 32 is connected with the pivot arm 30 via a shaft 30A to allow pivotal movement of the cylinder 32 whereas a cylinder tube of the cylinder 32 is fixed to the lifting member 28 via a shaft 32A to allow pivotal movement of the cylinder 32.
  • a male screw bar 18 is fitted in each female screw plate 36 to allow vertical movement of the lifting member 28.
  • each male screw bar 18 is rotatably supported by a base 16 and further engaged with a first toothed pulley 22B.
  • the table 10 fixed to the frame has a length, in the direction perpendicular to a feeding direction of veneers, equal to or greater than the width of veneers and is attached to a fixation base 12 and the plurality of bases 16.
  • a motor 14 which rotates in a normal direction and a reverse direction and is braked according to signals output from a controller (described later), is mounted on the fixation base 12 and has a shaft engaged with a second toothed pulley 22A.
  • the plurality of first toothed pulleys 22B are connected with the first toothed pulley 22A via a toothed belt 20, so that rotation of the motor 14 is transmitted to rotate the respective male screw bars 18.
  • a positioning roll 42 for defining a vertical position of a rear end of each veneer has a length, in the direction perpendicular to a feeding direction of veneers, equal to or greater than the width of veneers and is rotatably attached to the frame.
  • a plurality of pressure members 44 and 46 having a length, in the direction perpendicular to a feeding direction of veneers, equal to or greater than the width of veneers are used for joining a rear scarf-cut face of a first veneer with a front scarf-cut face of a second veneer, which is transported after the first veneer, via the thermosetting adhesive applied onto the respective scarf-cut faces.
  • the pressure members 44 and 46 respectively accommodate a heating medium (not shown) such as a heater or steam to heat the joint at the temperature of approximately 160 ° C. and cure the thermosetting adhesive on the scarf-cut faces.
  • the upper pressure member 44 is fixed to the frame whereas the lower pressure member 46 is supported by a cylinder 54 to allow vertical movement of the lower pressure member 46.
  • a plurality of feed-out rolls 48 and 50 for feeding out veneers have a length, in the direction perpendicular to a feeding direction of veneers, equal to or greater than the width of veneers.
  • the upper feed-out roll 48 and the lower feed-out roll 50 are supported by the frame (not shown) of the apparatus to bring the circumferential faces of the rolls into contact with each other.
  • a power-driven motor (not shown) functioning as an intermittent driving mechanism, which rotates in a normal direction and a reverse direction according to signals output from the controller (described later), is connected to the lower feed-out roll 50 via a clutch mechanism (not shown). Veneers are fed at appropriate intervals by the action of the clutch mechanism.
  • the plurality of rolls 2, 4, 48, and 50 form a transportation path along which veneers are successively fed and transported.
  • the adhesive application member 24 is driven by the above pivot mechanisms 26 and the lifting member 28 to move between a first position where the adhesive application member 24 is inserted into the adhesive reservoir 40 to take the adhesive on the respective adhesive-applying faces 24a and 24b thereof, a second position where the first adhesive-applying face 24a of the adhesive application member 24 is pressed in a substantially parallel configuration against the rear scarf-cut face of the first veneer to apply the adhesive on the first adhesive-applying face 24a to the rear scarf-cut face of the first veneer, which is held at a first holding position (described below), a third position which is apart from the transportation path, and a fourth position where the second adhesive-applying face 24b of the adhesive application member 24 is pressed in a substantially parallel configuration against the front scarf-cut face of the second veneer to apply the adhesive on the second adhesive-applying face 24b to the front scarf-cut face of the second veneer, which is held at a second holding position (described below).
  • the apparatus further includes a controller (not shown) for controlling operations of the plurality of feeding rolls 2 and 4, the plurality of feed-out rolls 48 and 50, the pressure roll 8, the cylinder 32, the motor 14, and the cylinder 54 in response to the detection signals transmitted from the detectors 6.
  • the controller measures the feeding distance of each veneer after output of detection signals from the detectors 6 using a rotary encoder (not shown). When the feeding distance becomes equal to one of preset values, the controller outputs corresponding one of operation signals and stop signals as described below.
  • the controller has a delay circuit therein to output a subsequent operation signal with a certain delay after the output of a specific operation signal or stop signal so as to activate respective elements of the apparatus after a predetermined time period corresponding to the certain delay.
  • a first veneer A previously cut to have a rear scarf-cut face a2 is held by the plurality of feed-out rolls 48 and 50 at a first holding position as shown in FIG. 2.
  • the first adhesive-applying face 24a of the adhesive application member 24, which is vertically and pivotally moved to the second position by the pivot mechanisms 26 and the lifting member 28, is brought into contact with the rear scarf-cut face a2 of the first veneer A (see FIGS. 6A and 6B). While the respective elements of the apparatus are held at a stand-by position shown in FIG.
  • the controller outputs a second veneer feed signal to activate the plurality of feeding rolls 2 and 4, which start feeding a second veneer B previously cut to have a front scarf-cut face b1 and a rear scarf-cut face (not shown) along the fibers of the veneer B as illustrated in FIG. 4.
  • the detector 6 sends a first adhesive application signal to the controller.
  • the controller activates the motor 14 in response to the first adhesive application signal to rotate the plurality of male screw bars 18 in a normal direction.
  • the rotation of the male screw bars 18 in the normal direction lifts the plurality of female screw plates 36 up to a predetermined position to take the adhesive application member 24, having the first and the second adhesive-applying faces 24a and 24b to which the thermosetting adhesive adheres, out of the adhesive reservoir 40.
  • the controller then outputs a pivot signal for contracting the rod of the cylinder 32 so as to rotate the pivot arm 30 in the direction of the arrow H (see FIG. 5).
  • the rotation of the pivot arm 30 rotates the adhesive application member 24 in the direction of the arrow P to incline the adhesive application member 24 as shown in FIG. 5.
  • the motor 14 actuated in response to a lifting signal output from the controller rotates the male screw bars 18 in the normal direction, so that the adhesive application member 24 is lifted up to the second position where the adhesive application member 24 comes into contact with the rear scarf-cut face a2 of the first veneer A (see FIG. 6A).
  • the thermosetting adhesive adhering to the first adhesive-applying face 24a of the adhesive application member 24 is accordingly applied onto the rear scarf-cut face a2 of the first veneer A held by the positioning roll 42.
  • the controller outputs a stand-by signal to drive the feed-out rolls 48 and 50 to transport the first veneer A (see FIG. 6B).
  • the controller When a rear end of the first veneer A reaches a predetermined waiting position (approximately in the middle of the pressure members 44 and 46 along the transportation path), the controller outputs a waiting signal to brake the feed-out rolls 48 and 50 and stop the first veneer A. After some time delay, the motor 14 rotates the male screw bars 18 in the normal direction to lift the adhesive application member 24 up to the third position.
  • the second veneer B is further transported until the front scarf-cut face b1 of the second veneer B reaches a second holding position below the adhesive application member 24 held at the third position (see FIG. 6C).
  • the controller then outputs a second adhesive application signal to brake the feeding rolls 2 and 4 and stop the second veneer B.
  • the controller subsequently outputs a first down signal to lower the pressure roll 8 (see FIG. 6D) to hold the second veneer B in between the pressure roll 8 and the table 10.
  • reverse rotation of the motor 14 rotates the male screw bars 18 in the reverse or downward direction to position the second adhesive-applying face 24b of the adhesive application member 24 at the fourth position where the second adhesive-applying face 24b is brought into contact with the front scarf-cut face b1 of the second veneer B.
  • the thermosetting adhesive adhering to the second adhesive-applying face 24b of the adhesive application member 24 is accordingly applied onto the front scarf-cut face b1 of the second veneer B.
  • the controller When the application of the adhesive onto the front scarf-cut face b1 of the second veneer B is completed, the controller outputs an end-of-application signal to expand the rod of the cylinder 32 and rotate the adhesive application member 24 in the direction of the arrow Q (see FIG. 6E). The illustrated long arm of the adhesive application member 24 is thus held in a downward orientation. After some time delay, the pressure roll 8 is lifted up and the feeding rolls 2 and 4 are driven to transport the second veneer B.
  • the controller outputs a second down signal to rotate the motor 14 in the reverse direction so as to rotate the male screw bars 18 in the reverse direction.
  • the reverse rotation of the male screw bars 18 lowers the female screw plates 36 to move the adhesive application member 24 to the original first position where the adhesive application member 24 is inserted in the adhesive reservoir 40.
  • the controller outputs a joint signal to brake the feeding rolls 2 and 4 and stop the second veneer B at the predetermined waiting position where the front scarf-cut face b1 of the second veneer B is aligned with the rear scarf-cut face a2 of the first veneer A.
  • the cylinder 54 then lifts up to apply a fixed pressure and a certain heat to the joint of the front scarf-cut face b1 with the rear scarf-cut face a2 via the pressure members 44 and 46 for a time period set in a timer.
  • the thermosetting adhesive applied onto the rear scarf-cut face a2 and the front scarf-cut face b1 is cured to securely join the rear scarf-cut face a2 of the first veneer A with the front scarf-cut face b1 of the second veneer B (see FIG. 6F).
  • the controller After the joint is completed, the controller outputs a feed-out signal to drive the feeding rolls 2 and 4 and the feed-out rolls 48 and 50 to transport the first veneer A and the second veneer B joined with each other.
  • the detector 6 When a rear end of the second veneer B reaches the certain position below the detector 6, the detector 6 outputs a rear end detection signal to the controller.
  • the controller When a rear scarf-cut face of the second veneer B reaches the first holding position of the first veneer A shown in FIG. 2, the controller outputs a stop signal to brake the feed-out rolls 48 and 50 and stop transportation of the first veneer A joined with the second veneer B.
  • FIGS. 7A through 7C show a modified method of applying the adhesive only on the rear scarf-cut face a2 of the first veneer A.
  • the motor 14 rotates the male screw bars 18 in the normal direction like FIG. 6A, so that the adhesive application member 24 is lifted up to the second position where the adhesive application member 24 comes into contact with the rear scarf-cut face a2 of the first veneer A (see FIG. 7A).
  • the thermosetting adhesive adhering to the first adhesive-applying face 24a of the adhesive application member 24 is accordingly applied onto the rear scarf-cut face a2 of the first veneer A held by the positioning roll 42.
  • the controller When the application of the adhesive onto the rear scarf-cut face a2 of the first veneer A is completed, the controller outputs an end-of-application signal to expand the rod of the cylinder 32 and rotate the adhesive application member 24 in the direction of the arrow R (see FIG. 7B). The long arm of the adhesive application member 24 is thus held in a downward orientation. After some time delay, the feeding rolls 2 and 4 are driven to transport the second veneer B.
  • the controller outputs a down signal to rotate the motor 14 in the reverse direction so as to rotate the male screw bars 18 in the reverse direction.
  • the reverse rotation of the male screw bars 18 lowers the female screw plates 36 to move the adhesive application member 24 to the first position where the adhesive application member 24 is inserted in the adhesive reservoir 40.
  • the controller outputs a joint signal to brake the feeding rolls 2 and 4 and stop the second veneer B at the predetermined waiting position where the front scarf-cut face b1 of the second veneer B is aligned with the rear scarf-cut face a2 of the first veneer A.
  • the cylinder 54 then lifts up to apply a fixed pressure and a certain heat to the joint of the front scarf-cut face b1 with the rear scarf-cut face a2 via the pressure members 44 and 46 for a time period set in a timer.
  • the thermosetting adhesive applied onto the rear scarf-cut face a2 is cured to securely join the rear scarf-cut face a2 of the first veneer A with the front scarf-cut face b1 of the second veneer B (see FIG. 7C).
  • the adhesive application member 24 is moved only between the first position and the second position.
  • the apparatus may be modified to apply the adhesive only on the front scarf-cut face b1 of the second veneer B.
  • the first adhesive-applying face 24a and the second adhesive-applying face 24b of the adhesive application member 24 are inclined to be pressed against the respective scarf-cut faces of veneers in a substantially parallel configuration.
  • a relatively thin cut-end of the veneer may be curved in a direction opposite to the scarf-cut direction (upward in the first veneer A and downward in the second veneer in FIG. 4). Inclination of the first adhesive-applying face 24a and the second adhesive-applying face 24b to be substantially parallel to the respective scarf-cut faces makes it difficult to apply the adhesive onto the scarf-cut faces uniformly along the fibers of the veneer.
  • the adhesive application member 24 is rotated at a smaller angle than the above embodiment in the direction of the arrow P of FIG. 5, so that the space between the adhesive-applying face 24a or 24b and the corresponding scarf-cut face becomes narrower on the thin-cut end of the veneer.
  • Vertical movement of the male screw plates 36 brings the adhesive-applying face 24a or 24b into contact first with the curved end of the veneer and then with the whole plane of the scarf-cut face by means of elasticity of the veneer. This ensures uniform application of the adhesive.
  • FIGS. 9A and 9B illustrate another structure of the space regulating mechanism for controlling the amount of the adhesive adhering to the first and the second adhesive-applying faces 24a and 24b of the adhesive application member 24, in which a space regulator roll 62 is used instead of the space regulator plate 38 of the above embodiment.
  • FIG. 9B is a partially-omitted cross sectional view taken on the line B--B of FIG. 9A.
  • a pair of larger-diametral rings 66 are mounted on both ends of the space regulator roll 62.
  • the larger-diametral rings 66 roll over an inclined face 40d formed on an upper side of the adhesive reservoir 40 to come into contact with the adhesive application member 24 by the gravity.
  • the space regulator roll 62 Since the diameter of the space regulator roll 62 is smaller than those of the rings 66, the space regulator roll 62 is held apart from the adhesive application member 24 by a fixed distance S1. This structure allows a substantially fixed amount of the adhesive to be applied onto the adhesive-applying face of the adhesive application member 24.
  • the amount of the adhesive is controlled with a variation in the distance S1 by replacing the rings 66 with rings having another diameter.
  • the adhesive application member 24 is vertically and pivotally moved to bring the first adhesive-applying face 24a and the second adhesive-applying face 24b into contact with the respective scarf-cut faces of the first and second veneers held at the preset positions.
  • the first and the second adhesive-applying faces 24a and 24b of the adhesive application member 24 are previously held in a middle of the transportation path and substantially parallel to the scarf-cut faces of the veneers to apply the adhesive on the adhesive-applying faces 24a and 24b to the scarf-cut faces of the veneers.
  • the detector 6 detects existence of the second veneer B transported along the transportation path.
  • the controller then outputs a wait signal to lift and rotate the adhesive application member 24, so that the first and the second adhesive-applying faces 24a and 24b of the adhesive application member 24 are held in a middle of the transportation path and substantially parallel to the scarf-cut faces of the first and second veneers A and B as illustrated in FIG. 10B.
  • the controller subsequently outputs an adhesive application signal to drive the feed-out rolls 48 and 50 in the reverse direction shown by the arrows in FIG. 10B.
  • the reverse rotation of the feed-out rolls 48 and 50 leads a backward movement of the first veneer A to a certain position shown in FIG. 10C where the rear scarf-cut face of the first veneer A comes into contact with the first adhesive-applying face 24a.
  • the second veneer B is further transported to a certain position shown in FIG. 10C where the front scarf-cut face of the second veneer B comes into contact with the second adhesive-applying face 24b.
  • the adhesive is accordingly applied onto both the rear scarf-cut face of the first veneer A and the front scarf-cut face of the second veneer B.
  • the controller then outputs a feed-out signal to drive the feed-out rolls 48 and 50 in the normal direction as shown by the arrows in FIG. 10D.
  • the first veneer A is transported forward with the normal rotation of the feed-out rolls 48 and 50.
  • the adhesive application member 24 is rotated and lifted down to a position shown by the solid line and then to a position shown by the phantom line in FIG. 10D.
  • the feeding rolls 2 and 4 are then rotated as shown by the arrows in FIG. 10D to transport the second veneer B forward and join the front scarf-cut face of the second veneer B securely with the rear scarf-cut face of the first veneer A.
  • the adhesive is applied onto both the rear scarf-cut face of the first veneer and the front scarf-cut face of the second veneer in this second embodiment, the adhesive may be applied to only one of the scarf-cut faces as long as sufficient adhesiveness is ensured.
  • FIG. 11 is a side view showing still another adhesive-applying apparatus as a third embodiment according to the invention.
  • the adhesive application member 24 does not rotate but moves linearly from the first position in the adhesive reservoir 40 to the second position for applying the adhesive on the scarf-cut face of the veneer or vice versa.
  • the supporting elements and the driving elements regarding the linear movement of the adhesive application member 24 are obliquely provided to hold the first and the second adhesive-applying faces 24a and 24b of the adhesive application member 24 in the adhesive reservoir 40 in parallel with the scarf-cut faces of the veneers.
  • the structure of the third embodiment does not include the supporting elements and the driving elements regarding the pivotal movement of the adhesive application member 24 such as the cylinder 32 shown in FIG. 2.
  • the motor 14 starts rotation to drive the female screw plates 36, thereby moving the adhesive application member 24 linearly between the first position and the second position.
  • the motor 14 then stops to hold the adhesive application member 24 at a position shown by the one-dot chain line in FIG. 11.
  • Application of the adhesive onto the scarf-cut face of the veneer is implemented in the same manner as above.
  • the structure of the invention allows the adhesive-applying face of the adhesive application member to be pressed in a substantially parallel configuration against the corresponding scarf-cut face of a veneer. A substantially fixed amount of adhesive is accordingly applied onto each scarf-cut face of the veneer.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
US08/327,422 1993-10-27 1994-10-21 Apparatus for applying adhesive onto scarf-cut face of veneer Expired - Fee Related US5582676A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP5-291423 1993-10-27
JP29142393A JP3426304B2 (ja) 1993-10-27 1993-10-27 スカーフカット面を有するベニヤ単板への接着剤塗布装置

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US5582676A true US5582676A (en) 1996-12-10

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US08/327,422 Expired - Fee Related US5582676A (en) 1993-10-27 1994-10-21 Apparatus for applying adhesive onto scarf-cut face of veneer

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US (1) US5582676A (sv)
JP (1) JP3426304B2 (sv)
KR (1) KR0158932B1 (sv)
CA (1) CA2134288C (sv)
FI (1) FI945045A (sv)
MY (1) MY116339A (sv)
TW (1) TW255838B (sv)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008083786A1 (de) * 2006-12-22 2008-07-17 Vatron Gmbh Verfahren und vorrichtung zum lackieren von schnittflächen
WO2011051565A1 (en) * 2009-10-28 2011-05-05 Upm-Kymmene Wood Oy Method and apparatus for manufacturing plywood
JP2013256128A (ja) * 2009-07-09 2013-12-26 Meinan Mach Works Inc セパレーテッドスカーフによる板材の接合方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0855231A1 (en) * 1995-09-07 1998-07-29 Nippon Steel Corporation Device for painting a cut surface of a pre-coated steel plate
JP4616182B2 (ja) * 2006-01-30 2011-01-19 三菱電機株式会社 永久磁石式回転子用の接着剤塗布装置及び接着剤塗布方法

Citations (9)

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US2317446A (en) * 1941-02-01 1943-04-27 Perkins Glue Co Veneer gluing machine
US2644496A (en) * 1948-06-15 1953-07-07 Plywood Res Foundation Edge gluing device
US3025830A (en) * 1959-06-08 1962-03-20 Lawrence A Vierthaler Adhesive applicator
DE1957676A1 (de) * 1969-11-17 1971-05-27 Hausmann Blomberger Holz Verfahren und Einrichtungen zum selbsttaetigen Zusammenlegen von duennschichtigen,beleimten Platten,vorzugsweise Furniere
US4042440A (en) * 1975-02-20 1977-08-16 Meinan Machinery Works, Inc. Method and apparatus for splicing of veneer sheets
US4243465A (en) * 1979-01-11 1981-01-06 Ilia Gozzi Apparatus for joining pieces of laminar material and in particular plywood core strips
JPS5610165A (en) * 1979-07-05 1981-02-02 Sumitomo Chem Co Ltd Novel beta-lactam compound and its production
US4530306A (en) * 1984-01-06 1985-07-23 Graphic Enterprises Of Ohio, Inc. Coating device for plates
JPH0525841A (ja) * 1991-07-22 1993-02-02 Meidensha Corp 取水井選択装置

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2317446A (en) * 1941-02-01 1943-04-27 Perkins Glue Co Veneer gluing machine
US2644496A (en) * 1948-06-15 1953-07-07 Plywood Res Foundation Edge gluing device
US3025830A (en) * 1959-06-08 1962-03-20 Lawrence A Vierthaler Adhesive applicator
DE1957676A1 (de) * 1969-11-17 1971-05-27 Hausmann Blomberger Holz Verfahren und Einrichtungen zum selbsttaetigen Zusammenlegen von duennschichtigen,beleimten Platten,vorzugsweise Furniere
US4042440A (en) * 1975-02-20 1977-08-16 Meinan Machinery Works, Inc. Method and apparatus for splicing of veneer sheets
US4243465A (en) * 1979-01-11 1981-01-06 Ilia Gozzi Apparatus for joining pieces of laminar material and in particular plywood core strips
JPS5610165A (en) * 1979-07-05 1981-02-02 Sumitomo Chem Co Ltd Novel beta-lactam compound and its production
US4530306A (en) * 1984-01-06 1985-07-23 Graphic Enterprises Of Ohio, Inc. Coating device for plates
JPH0525841A (ja) * 1991-07-22 1993-02-02 Meidensha Corp 取水井選択装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008083786A1 (de) * 2006-12-22 2008-07-17 Vatron Gmbh Verfahren und vorrichtung zum lackieren von schnittflächen
JP2013256128A (ja) * 2009-07-09 2013-12-26 Meinan Mach Works Inc セパレーテッドスカーフによる板材の接合方法
WO2011051565A1 (en) * 2009-10-28 2011-05-05 Upm-Kymmene Wood Oy Method and apparatus for manufacturing plywood

Also Published As

Publication number Publication date
JPH07117012A (ja) 1995-05-09
KR0158932B1 (ko) 1998-12-15
TW255838B (sv) 1995-09-01
MY116339A (en) 2004-01-31
CA2134288C (en) 1999-01-26
FI945045A0 (sv) 1994-10-26
KR950011077A (ko) 1995-05-15
FI945045A (sv) 1995-04-28
CA2134288A1 (en) 1995-04-28
JP3426304B2 (ja) 2003-07-14

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